So the low band slips? I thought it would be capable to handle the load by itself without slippage. Am I correct in my thinking that the sprag only moves a fraction of an inch before it locks or does it slip a measurable amount.By hand they appear to lock instantly. Doesnt the THM 400 use no roller and a band only for first? I know my 727 needs an aftermarket front drum to be safe but I was thinking the LBA was going to make it bulletproof at least as far as sprag failure. I'm footbraking in the 10s with no LBA and factory drum,with factory sprag I drilled and bolted myself.